The Detroit 5133357 is a genuine OEM thermostat engineered for precise engine temperature regulation in various Detroit Diesel engines. Featuring a confirmed 180°F (82.2°C) opening temperature, this thermostat ensures efficient cooling system operation and helps maintain optimal engine operating temperatures. It is compatible with Detroit Diesel Series 50, Series 60, DDC 13, DDC 15, and DDC 16 engines, providing reliable performance and direct fitment for heavy-duty applications.